Don't know to be honest.
There was a frosty atmosphere between himself and the relarives in particular AE pre massacre, money disputes etc. Osea problems etc
He himself called them " Fucking vultures"
Within hours of the massacre, AE was disbeliving him reference the foster conversation.
I would have thought he would have closed them off completley to WHF to be honest. He had the descretion to do so.
He did, but the farm had been a bane ever since childhood, returning to that desolate landscape after incarceration at that other alien environment, Gresham's School. No wonder the alienation increased year on year, as those intimate strangers at White House Farm became ever distant, to the point he could endure no more. Following the Suzette break up and the miscarriages, which he blamed squarely on the stress induced by his parents, he vowed to exact revenge, and the extermination plan began to germinate in what already was a detached and unbalanced mind.